Cummins Onan A-Series 3.4L 4-Cyl & 6-Cyl new water pump impeller for 170-3891-A. Cummins Onan A-Series 3.4L 4-Cyl & 6-Cyl engines. new water Impeller for the following applications The water pump OEM number is 131-0402 and the casting number is 170-3891-A, 170-4320A and 160239.
